Imperial College London
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DrAnnaHankin

Faculty of Engineering, Department of Chemical Engineering

Lecturer
 
 
 
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Contact

 

anna.hankin Website

 
 
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Location

 

510ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bedoya:2017:10.1039/C7TA05125E,
author = {Bedoya, Lora FE and Hankin, A and Kelsall, G},
doi = {10.1039/C7TA05125E},
journal = {Journal of Materials Chemistry A},
pages = {22683--22696},
title = {En route to a unified model for photo-electrochemical reactor optimization. I - Photocurrent and H yield predictions},
url = {http://dx.doi.org/10.1039/C7TA05125E},
volume = {5},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A semi-empirical model was developed for prediction of photocurrent densities and implemented to predict the performance of a photo-electrochemical reactor for water splitting in alkaline solutions, using Sn-doped α-FeO photo-anodes produced by spray pyrolysis. Photo-anodes annealed at different temperatures were characterized using photo-electrochemical impedance spectroscopy, cyclic voltammetry in the presence and absence of a hole scavenger and also the open circuit potential under high intensity illumination. Mott-Schottky analysis was used cautiously to estimate charge carrier concentration and the flat band potential. In addition to overpotential/current distribution and ohmic potential losses, the model also accounts for absorbed photon flux, surface and bulk electron-hole recombination rates, gas desorption, bubble formation and (H-O) cross-over losses. This allows the model to estimate the total yield of hydrogen, charge and gas collection efficiencies. A methodology is presented here in order to evaluate parameters required to assess the performance of a photo-electrochemical reactor in 1D and 2D geometries. The importance of taking into account bubble generation and gas desorption is discussed, together with the difficulties of measuring charge carrier concentration and electron-hole recombination in the bulk of the semiconductor, which are of major importance in the prediction of photocurrent densities.
AU  - Bedoya,Lora FE
AU  - Hankin,A
AU  - Kelsall,G
DO  - 10.1039/C7TA05125E
EP  - 22696
PY  - 2017///
SN  - 2050-7496
SP  - 22683
TI  - En route to a unified model for photo-electrochemical reactor optimization. I - Photocurrent and H yield predictions
T2  - Journal of Materials Chemistry A
UR  - http://dx.doi.org/10.1039/C7TA05125E
UR  - http://hdl.handle.net/10044/1/51668
VL  - 5
ER  -
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